Damage to the renal medulla would interfere first with the functioning of the a. glomerular capsules, b. distal convoluted tubules, c. collecting ducts, d. proximal convoluted tubules.

Video transcript

Hi, everybody. Welcome back. Our next problem says, damage to the renal medulla could affect the functioning of the collecting duct resulting in a decreased urine con concentration. B, increased urine concentration, C impaired excretion of urea or d enhanced water resorption. So let's think about what damage to the reno Mandula would cause. And it tells the problem tells us right here that the particular damage they're talking about is damage that would affect the functioning of the collecting duct. And what do we recall happens in the collecting duct. This is where urine is concentrated. So water is reabsorbed to concentrate the urine. So if the collecting duct can't perform its function of concentrating urine, then the answer here would be choice. A decreased urine concentration, that water won't be reabsorbed and the urine will be more diluted than it should be. So, choice B obviously incorrect, increased urine concentration. Uh The exact opposite will happen. Then we moved down to choice C impaired excretion of urea. Uh This occurs primarily in the renal tubules. So it won't be necessarily affected by damage to the collecting duct. So choice C won't be our correct answer. And then finally, to the enhanced water reabsorption. Again, the collecting ducts will not be able to absorb reabsorb water in the way they should. So there will be decreased water reabsorption if you have damage to the collecting duct. So choice d also the opposite of what would happen. So again, damage serena medulla that could affect the functioning of the collecting duct would result in choice a decreased urine concentration. See you in the next video.